The weak-field expansion for processes in a homogeneous background magnetic field

Details The weak-field expansion for processes in a homogeneous background magnetic field The weak-field expansion for processes in a homogeneous background magnetic field

1999-12-15

arxiv.org/abs/hep-th/9912134v2

Phys.Rev. D62 (2000) 105014

Physics

High Energy Physics

High Energy Physics - Theory

17 pages, section IIIB added, some typos corrected

Scientific paper

10.1103/PhysRevD.62.105014

The weak-field expansion of the charged fermion propagator under a uniform magnetic field is studied. Starting from Schwinger's proper-time representation, we express the charged fermion propagator as an infinite series corresponding to different Landau levels. This infinite series is then reorganized according to the powers of the external field strength $B$. For illustration, we apply this expansion to $\gamma\to \nu\bar{\nu}$ and $\nu\to \nu\gamma$ decays, which involve charged fermions in the internal loop. The leading and subleading magnetic-field effects to the above processes are computed.

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